Power hammer



-March 17.- 1925. 1,529,742

' A. s. HOVANDER POWER HAMMER Filed Jan. 11, 1924 INVENTOR Aqqwf ifiammr 7 flTTOHNEY Patented Mar. 17 1925.

UNITED 1 STATES PATENT, OF

AUGUST s. HovAnD n, or BURLINGTON, WASHINGTON.

POWER HAMMER.

Application filed January 11, 1924. Serial No. 685,546.

T all whom it may concern: 7

Be it known that I, AUGUST S. HovANDER, a sub ect of the King of Sweden, residing at Burlingtomin the county of Skagit and which the head will travel in a vertical plane so that the striking surface of the head will be parallel to the surface of the anvil when it engages the anvil or material on the anvil and in which the head is operated by an eccentric through a spring.

The object of the invention is to provide a power hammer in which the striking surface of the hammer will be in a horizontal position as it delivers a blow.

Another object of the invention is to provide a power hammer in which the hammer is operated by an eccentric through a spring member.

And a further object of the invention is to provide a power hammer with a -belt shifter and a brake operated by a common lever so that the movement of the hammer may be retarded or positively controlled.

lVith these ends in. view the invention embodies a power hammer having the head supported from a suitable frame by a double connection with four pivot points, a yoke for connecting one of the supporting members to an eccentric on a. shaft having a tight and loose pulley and also a brake, a means for shifting the belt on the pulley and for operating the brake, and an anvil at the forward end of the machine.

Other features and advantages of the invention will be seen fromthe following description taken in connection with the drawings, wherein Figure 1 is a side view.

Figure 2 is a front view.

Figure 3 is a rear View.

Figure 4 is a section showing the brake.

In the drawings I have shown my device as it would be constructed wherein numeral 1 indicates the hammer head which is supported on a spring member 2 and a rod 3. The head is provided with openings 4, 5, and 6 through which the supporting member may be attached to it by pins 7 and 8. It will be seen that by attaching the spring member Co the opening 4, and the rod 3 to e the opening 5 as shown, the flatsurface of the hammer head will be in the downward position as shown, and by reversing the head and-"attaching the -rod3 to the head through the opening 6, the rounded end 10 of therhead may be placed in the downward position. I v

The spring member 2 may be constructed with a long flat piece of spring steely- 11 through its center one end of which may be attached to the pin 4 and the other may ex;-

tend. to the point 12 at the rear ofthe machine. Other fiat pieces of spring steel 13 and 14 maybe placedon each sideofthe member ll and their. forward ends 0011- nected by a ring 15 as shown in Figure 1. The ends of these members .may extend practically to-the edges of the hammerl so that the member 11 will be supported for F-ICE! 1 substantially its entire length. Other flat pieces of springsteel 16 and 17 may be placed on the outside of the. members 13 and 14 and the ends of these members held togetherby a ring 18 andextending from the point- 12'at the :rear of'themachine to a point 19. a'short distance from thehea-d 1. And other flat pieces of spring steel 20 and 21 may be placed on the outside of the members 16 and 17 and their ends held together by a ring '22 and extending from points 12t0 a point 23 a short distance from .the ring 18. These members will form a leaf spring which will be held in a clamp the sides.

24 and pivoted to a plate 25 by pins 26 The rod3 will be provided with eyes 27 and 28 at each end; one of whichfiwill be pivot-ally mounted on the pin 8 in the head .r

and the other pivotally mounted between i theplates 25011: pin-29L At the rear of the spring is a. sliding member 30 which may be held to the spring by a set screw 31 and in this member is a. pin 32 upon which a yoke 33, which extends downwarch' is pivotally mounted. The lowerend of the-yoke '33 is provided with an eye or bear ing 34 which is pivotally attached to an off-set 35 of a shaft 36 which is pivotally mounted in-bearings 37 and 38 of themain frame. The shaft 36 extendsthrough the hearings on one side and on this extended end is a tight pulley 39 and a loose pulley 40 over which a belt 41 will pass. On the opposite end of the shaft 36 is a pulley or drum 42 over which a metal band 43, the

a brake. It will be seen that as the/band 43 is drawn do'wnwardit will frictionally and 4 and on the outer end of this section the frame on pins 47. One le her will form the rod 44 tow to it by a set th-isweight will-hold theforward end of lower ends of which are attached to a rod 44 as shown in Figure 4, may pass to form grip the pulley or drum 42 and thereby retard or stop the motion of the hammer. A collar may be placed on the/shaft 36 which will engage the side of. the bearing 38 and prevent the shaft moving in that di-" rection. AU bar 46 will extend from the forward end of the machine to the rear. on both sides and each side will'be pivoted to of this memich' the brake band 43 is .attached'as shown in Figures 3,

is a weight 48, which may be adjustably held screw 49. It will be seen that the'bar upward and pull the brake down- -Ward to stop the machine-as soon as the forward end of the member 46 is released, The opposite-side of the member 46, which I have indicated by the numeral 50, will extend along the opposite side and engage a slotted opening 51 in a lever 52 which is pivotally mounted on a support 53 by apin The opposite end of the lever is provided. with a U .frame 55 through which the belt 41 may pass and by which the belt may be shifted from one pulley to the other as may be desired. It will'be observed that theU frame 55 will engage both sides of the belt at both edges.

The main frame may two inverted U-shaped members '56 and 57 and a supporting member .58 .as shown;

2 Thesemembers maybe tied together by other may be in the type of anvil used, an-' othenmay be in the design of the main suitable cross bars and attached to suitable base or foundation.

At the forward end of the machine is an anvil 59 whichmay be constructed with a piece ofpipe or tubing 60 having a flange ,6 l at. its lower end and its upper end squared, and; a rectangular shaped piece of hard steel or other' suitable material 62 which may be-placed inside of the member It will be understood that changes may be made inthe' construction without departing from the spirit of the v invention. One of which changes may be in the design, shape or proportion of any of the members, an-

, frame, another .inaybe' in the type of eccentric, another may be in the use of a brake of a different design, and still another may be in the use of anysuitablemotive power instead of the belt and pulleys as shown;

be constructed with The construction will be readily understood from the'i'foregoing description. To use the device it may be assembled as shown in Figure 1 and it will be seen that as power is applied, or the eccentric rotated, the hammer head will move upward and downward in a vertical plane, and as it moves downward the spring member 2 will first permit it to drag slightly behind and then bring it down with a quick hard blow. The rings "l5, l8, and 22 will protect the spring member2 and prevent its breaking or bending with the rebound. It will be seen that the length of stroke may be adjusted by sliding the member 30* backward or forward on the spring memberor by placing the pin 32 through'different holes in the end of the yoke 33. I 1

Having thusfully described the invention, what I claim as new and desire to secure by Letters Patent, is r 1. A power. hammer having ahead, a spring member pivotally attached. to said head, a frame in. which said spring mem- 2. A. power hammer having an anvil; a

head directly above the anvil; a spring ,mem'ber constructed of a flat/piece of material with'one long piece forming a central 7 member and other pieces of di fli'eren't. lengths on the sides of the 1centralflmember, said latter members having rings for'tying their free ends together; a socket for pivotally holding the spring member in'the frame; I

a bar parallel to the spring member, one end, ofwhich is. pivotally attached tothe frame at a point 'above the pivot point of the spring member, and the other vend of which is pivotally attachedto the head at a point above the point at which thespring memberis' attached to the head; a socket adj ust-ably held to'the rear end of the spring member; a'yoke pivotally attached to the socket at its upper end; an eccentric on which the yoke is pivotal'ly mounted means for rotatii'ig the eccentric a brake for holding the eccentricganda commonmeans by which the brake and meansfor rotating the" eccentric may be operated simultaneously.

AUGUST S; HOVANDEB. 

